Suggest an update Name* Categories* State* Locality* ZIP* Street address* Phone* Website* Company description* Visit the hotel River Rock Grill, which is in the state Massachusetts (MA), city Maynard. Our hotel can be found at 163 Main St, Maynard, MA 01754-2509. Great deals on best and cheap hotels. Your comments* (not for publishing) * — Required information River Rock Grill/163 Main St - Maynard - Massachusetts (MA) ← View details 163 Main St, Maynard, MA 01754-2509, Maynard, Massachusetts (MA) +1 978-897-5500